The $WINDOWS.~BT and $WINDOWS.~WS folders are associated with the Windows 10 upgrade process. They may appear on either Windows 7, 8, or 10, using gigabytes of disk space.
In the Folder C:/Windows/Prefetch there are many.pf files. I was advised to Delete ANY.pf file (related to any application) that I do not need at boot. Sep 27, 2017 Another great feature of Windows 10 is the Virtual Desktop. This has been the first time Windows openly supported multiple Desktops and using new View pane to setup multiple virtual desktops. This is very useful if you want to setup different work modes.
These are hidden files, so you’ll have to show hidden files in Windows Explorer or File Explorer to see them.
On Windows 7 and 8
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During the free Windows 10 upgrade period, Windows 7 and 8 automatically downloaded Windows 10 installation files and stored them in the $WINDOWS.~BT folder. When you agreed to the free upgrade, it could start quickly using the already downloaded installation files.
The free upgrade period is now over, so you couldn’t use these files to upgrade to Windows 10 even if you wanted to.
Microsoft should eventually remove these files if they’re still present on any Windows 7 or 8 systems, but they may still be sticking around for now.
On Windows 10
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On Windows 10, the $WINDOWS.~BT folder contains your previous Windows installation. These files are used to downgrade to a previous version of Windows, or a previous build of Windows 10.
It’s similar to the Windows.old folder, which contains files from your previous Windows installation. In fact, you’ll see both folders after upgrading to Windows 10–both Windows.old and $WINDOWS.~BT folders.
It also contains log files. For example, if you download and run the media creation tool, it creates a $WINDOWS.~BT folder with a few setup log files. That media creation tool also creates a $WINDOWS.~WS folder that contains most of the Windows setup files.
Windows should automatically delete these files to free up space after ten days in the Anniversary Update, or thirty days if your PC hasn’t upgraded to the Anniversary Update yet.
Can You Delete It, and How?
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Warning: If you choose to delete the $WINDOWS.~BT folder on Windows 10, you won’t be able to downgrade to the previous build of Windows 10 or previous version of Windows your PC had installed. The option to roll your PC back at Settings > Update & Security > Recovery will vanish. However, Windows 10 automatically deletes these files after ten days anyway.
If you want to delete these files, though, you can. But you shouldn’t just delete them the normal way. Instead, you should use the Disk Cleanup tool included with whatever version of Windows you’re using.
To do so, access the Disk Cleanup tool and click “Clean Up System Files”. Check the following items in the list and remove them:
- Previous Windows installation(s): This deletes the $WINDOWS.~BT and Windows.old folders on Windows 10.
- Temporary Windows installation files: This deletes the $WINDOWS.~BT folder on Windows 7 and 8, and the $WINDOWS.~WS folder on Windows 10.
Click “OK” to remove the files.
If the $WINDOWS.~BT folder is still present afterwards, it likely just contains a few spare log files–or now-useless setup files on Windows 7 or 8–and you can try deleting it manually from File Explorer. Just right-click it and select “Delete”.
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Although it's perfectly natural to get annoyed by Windows' seemingly endless ‘New updates are available' alerts, it's not a good idea to ignore them. You do so at your own risk.
The vast majority of updates (which arrive on your system courtesy of the Windows Update tool) deal with security. Microsoft routinely patches newly discovered holes, adds malware definitions to its Windows Defender and Security Essentials utilities, bolsters Office security, and so on. And don't forget the occasional Windows hotfix, which may address serious issues such as random system lockups.
In other words, yes, it's absolutely necessary to update Windows. But it's not necessary for Windows to nag you about it every time.
Step by Step
Step 1. To make Windows Update work mostly behind the scenes, click Start, type
Windows Update
, and press Enter. (In Windows XP, head to the Control Panel and seek out Windows Update.)Step 2. Next, click the Change Settings option, and choose Install updates automatically. Click OK to finish the process. Now, the only time you'll hear from Windows Update is when it requires a reboot.
(For more solutions to perplexing PC problems, see 'The 21 Greatest PC Mysteries--Solved!')
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